server {
    listen       80;
    listen  [::]:80;

    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_redirect off;
        proxy_pass http://gunicorn:8000;
    }

    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}